3Com 3032 Configuration Manual page 209

of a call that reaches X.25 interface may be inconsistent with X.121 address of the
destination interface (because the destination address of this call is modified
within the network), still the interface will accept this call. At this time, one or
multiple aliases should be specified for this interface by performing the following
tasks in the interface view:
Table 242 Specify/Cancel an alias for the interface
Task
Specify an alias for the interface
Cancel the specification of an alias for the
interface
To satisfy the requirements of different networks, nine matching modes and the
formats of corresponding alias strings are defined for X.25 in 3Com Router series,
as shown in the following table.
Table 243 Alias match modes and meanings
Matching mode
Free
free-ext
Left
left-ext
Right
right-ext
Strict
Whole
whole-ext
3 Configure the attributes related to the address code block in the call packet or call
accept packet
As specified in X.25 protocol, the call packet must carry the information set of
both the calling DTE address (source address) and the called DTE address
(destination address). This address information set is called the address code block.
While in call accept packet, some networks require that both (the calling DTE
address and the called DTE address) be carried, some networks require that only
one of the two be carried, while some others require that neither should be
carried. X.25 in 3Com Router series enables users to make choices according to
the requirement of specific network. Perform the following task in interface view.
Meaning
Free matching, the alias string is in
the form of 1234
Extended free matching, the alias
string is in the form of ...1234..
Left-justified matching mode, the
alias string is in the form of $1234
Extended left-justified matching
mode, the alias string is in the
form of $1234...
Right-justified match mode, the
alias string is in the form of 1234$
Extended right-justified matching
mode, the alias string is in the
form of ....1234$
Strict matching mode, the alias
string is in the form of $1234$
Whole matching mode, the alias
string is in the form of ........
Extended whole matching mode,
the alias string can only be *
Configure X.25
Command
x25 alias-policy match-type
alias-string
undo x25 alias-policy
match-type alias-string
Example
1234 will match with 561234,
1234567 and 956123478, but will
not match with 12354.
...1234.. will match with
678123459, but will not match
with 68123459, 67812345 and
6781234591.
$1234 will match with 1234567
and 12346790, but will not match
with 3123478 and 123784.
$1234... will match with 1234679
and 1234872, but will not match
with 123468 and 12346890.
1234$ will match with 791234 and
6901234, but will not match with
7912345 and 6212534.
....1234$ will match with
79001234 and 86901234, but will
not match with 7912345 and
506212534.
$1234$ can only match with 1234
........ will match with all the valid
X.121 addresses with the length of
8
* will match with all the valid X.121
addresses
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